“She helps keep Rob in check with his health and makes sure he is abiding by his diet and exercising,” says the source. “He feels there’s strong potential for this relationship to go a long way but for now they are very content and complement each other really well.”

Another source says Kardashian, 28, has been “out and about a ton” since starting the new relationship.

“For the first time in forever, Rob seems very excited about the future,” says the source.